[GHC] #14902: GHC HEAD cannot be booted with GHC 8.4.1

[GHC]

#14902: GHC HEAD cannot be booted with GHC 8.4.1
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        Reporter:  osa1              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Magiclouds):

 @hvr I reproduced this in two ways.

 1. github source got me this. Also some submodules cannot be initialized,
 the cloning just stuck.

 2. git.haskell.org source works, until somehow it broke ghc in my system.
 I did not install new ghc, no idea how it did it. I got messages like
 following when '''ghc-pkg check'''.

     cannot find any of ["libHSghc-prim-0.5.2.0.a","libHSghc-
 prim-0.5.2.0.p_a","libHSghc-prim-0.5.2.0-ghc8.4.3.so","libHSghc-
 prim-0.5.2.0-ghc8.4.3.dylib","HSghc-prim-0.5.2.0-ghc8.4.3.dll"] on library
 path
     There are problems in package rts-1.0:
     Warning: library-dirs: $HOME/src/Git/ghc/rts/dist/build doesn't exist
 or isn't a directory

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14902#comment:4>
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